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<li class="chapter" data-level="" data-path="abstract.html"><a href="abstract.html"><i class="fa fa-check"></i>内容概要</a></li>
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<li class="chapter" data-level="1" data-path="data-read-write-description.html"><a href="data-read-write-description.html"><i class="fa fa-check"></i><b>1</b> 数据导入导出</a>
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<li class="chapter" data-level="1.1" data-path="readxl-description.html"><a href="readxl-description.html"><i class="fa fa-check"></i><b>1.1</b> readxl</a>
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<li class="chapter" data-level="1.1.1" data-path="readxl-description.html"><a href="readxl-description.html#readxl:install"><i class="fa fa-check"></i><b>1.1.1</b> 安装</a></li>
<li class="chapter" data-level="1.1.2" data-path="readxl-description.html"><a href="readxl-description.html#readxl:usage"><i class="fa fa-check"></i><b>1.1.2</b> 用法</a></li>
<li class="chapter" data-level="1.1.3" data-path="readxl-description.html"><a href="readxl-description.html#batch:read"><i class="fa fa-check"></i><b>1.1.3</b> 批量读取</a></li>
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<li class="chapter" data-level="1.2" data-path="writexl.html"><a href="writexl.html"><i class="fa fa-check"></i><b>1.2</b> writexl</a>
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<li class="chapter" data-level="1.2.1" data-path="writexl.html"><a href="writexl.html#writexl:usage"><i class="fa fa-check"></i><b>1.2.1</b> 用法</a></li>
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<li class="chapter" data-level="1.3" data-path="openxlsx-description.html"><a href="openxlsx-description.html"><i class="fa fa-check"></i><b>1.3</b> openxlsx</a>
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<li class="chapter" data-level="1.3.1" data-path="openxlsx-description.html"><a href="openxlsx-description.html#openxlsx:install"><i class="fa fa-check"></i><b>1.3.1</b> 安装</a></li>
<li class="chapter" data-level="1.3.2" data-path="openxlsx-description.html"><a href="openxlsx-description.html#openxlsx:functions"><i class="fa fa-check"></i><b>1.3.2</b> 基础功能</a></li>
<li class="chapter" data-level="1.3.3" data-path="openxlsx-description.html"><a href="openxlsx-description.html#定制格式输出"><i class="fa fa-check"></i><b>1.3.3</b> 定制格式输出</a></li>
<li class="chapter" data-level="1.3.4" data-path="openxlsx-description.html"><a href="openxlsx-description.html#函数参数"><i class="fa fa-check"></i><b>1.3.4</b> 函数参数</a></li>
<li class="chapter" data-level="1.3.5" data-path="openxlsx-description.html"><a href="openxlsx-description.html#总结"><i class="fa fa-check"></i><b>1.3.5</b> 总结</a></li>
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<li class="chapter" data-level="1.4" data-path="readr-package.html"><a href="readr-package.html"><i class="fa fa-check"></i><b>1.4</b> readr</a>
<ul>
<li class="chapter" data-level="1.4.1" data-path="readr-package.html"><a href="readr-package.html#readr:install"><i class="fa fa-check"></i><b>1.4.1</b> 安装</a></li>
<li class="chapter" data-level="1.4.2" data-path="readr-package.html"><a href="readr-package.html#readr:usage"><i class="fa fa-check"></i><b>1.4.2</b> 用法</a></li>
<li class="chapter" data-level="1.4.3" data-path="readr-package.html"><a href="readr-package.html#readr:write-function"><i class="fa fa-check"></i><b>1.4.3</b> 导出功能</a></li>
<li class="chapter" data-level="1.4.4" data-path="readr-package.html"><a href="readr-package.html#总结-1"><i class="fa fa-check"></i><b>1.4.4</b> 总结</a></li>
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<li class="chapter" data-level="1.5" data-path="data-vroom.html"><a href="data-vroom.html"><i class="fa fa-check"></i><b>1.5</b> vroom</a>
<ul>
<li class="chapter" data-level="1.5.1" data-path="data-vroom.html"><a href="data-vroom.html#安装"><i class="fa fa-check"></i><b>1.5.1</b> 安装</a></li>
<li class="chapter" data-level="1.5.2" data-path="data-vroom.html"><a href="data-vroom.html#用法"><i class="fa fa-check"></i><b>1.5.2</b> 用法</a></li>
</ul></li>
<li class="chapter" data-level="1.6" data-path="data-rstudio-addins.html"><a href="data-rstudio-addins.html"><i class="fa fa-check"></i><b>1.6</b> Rstudio导入</a>
<ul>
<li class="chapter" data-level="1.6.1" data-path="data-rstudio-addins.html"><a href="data-rstudio-addins.html#rstudio-工具栏导入"><i class="fa fa-check"></i><b>1.6.1</b> rstudio 工具栏导入</a></li>
<li class="chapter" data-level="1.6.2" data-path="data-rstudio-addins.html"><a href="data-rstudio-addins.html#插件导入"><i class="fa fa-check"></i><b>1.6.2</b> 插件导入</a></li>
</ul></li>
<li class="chapter" data-level="1.7" data-path="data-file-path.html"><a href="data-file-path.html"><i class="fa fa-check"></i><b>1.7</b> 文件路径</a>
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<li class="chapter" data-level="1.7.1" data-path="data-file-path.html"><a href="data-file-path.html#指定路径"><i class="fa fa-check"></i><b>1.7.1</b> 指定路径</a></li>
<li class="chapter" data-level="1.7.2" data-path="data-file-path.html"><a href="data-file-path.html#默认路径"><i class="fa fa-check"></i><b>1.7.2</b> 默认路径</a></li>
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<li class="chapter" data-level="1.8" data-path="data-expand.html"><a href="data-expand.html"><i class="fa fa-check"></i><b>1.8</b> 拓展</a>
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<li class="chapter" data-level="1.8.1" data-path="data-expand.html"><a href="data-expand.html#tidyxl:package"><i class="fa fa-check"></i><b>1.8.1</b> tidyxl</a></li>
<li class="chapter" data-level="1.8.2" data-path="data-expand.html"><a href="data-expand.html#参考资料"><i class="fa fa-check"></i><b>1.8.2</b> 参考资料</a></li>
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</ul></li>
<li class="chapter" data-level="2" data-path="Data-Manipulation-dplyr.html"><a href="Data-Manipulation-dplyr.html"><i class="fa fa-check"></i><b>2</b> 数据处理之-dplyr</a>
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<li class="chapter" data-level="2.1" data-path="dplyr-description.html"><a href="dplyr-description.html"><i class="fa fa-check"></i><b>2.1</b> 前言</a>
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<li class="chapter" data-level="2.1.1" data-path="dplyr-description.html"><a href="dplyr-description.html#dplyr:install-package"><i class="fa fa-check"></i><b>2.1.1</b> 安装</a></li>
<li class="chapter" data-level="2.1.2" data-path="dplyr-description.html"><a href="dplyr-description.html#dplyr:difference-of-sql"><i class="fa fa-check"></i><b>2.1.2</b> Excel and Sql 类比</a></li>
<li class="chapter" data-level="2.1.3" data-path="dplyr-description.html"><a href="dplyr-description.html#常见问题"><i class="fa fa-check"></i><b>2.1.3</b> 常见问题</a></li>
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<li class="chapter" data-level="2.2" data-path="dplyr-usage.html"><a href="dplyr-usage.html"><i class="fa fa-check"></i><b>2.2</b> 基础用法</a>
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<li class="chapter" data-level="2.2.1" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-filter"><i class="fa fa-check"></i><b>2.2.1</b> filter</a></li>
<li class="chapter" data-level="2.2.2" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-select"><i class="fa fa-check"></i><b>2.2.2</b> select</a></li>
<li class="chapter" data-level="2.2.3" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-rename"><i class="fa fa-check"></i><b>2.2.3</b> rename</a></li>
<li class="chapter" data-level="2.2.4" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-relocate"><i class="fa fa-check"></i><b>2.2.4</b> relocate</a></li>
<li class="chapter" data-level="2.2.5" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-mutate"><i class="fa fa-check"></i><b>2.2.5</b> mutate</a></li>
<li class="chapter" data-level="2.2.6" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-arrange"><i class="fa fa-check"></i><b>2.2.6</b> arrange</a></li>
<li class="chapter" data-level="2.2.7" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-summarise"><i class="fa fa-check"></i><b>2.2.7</b> summarise</a></li>
<li class="chapter" data-level="2.2.8" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-groupby"><i class="fa fa-check"></i><b>2.2.8</b> group_by</a></li>
</ul></li>
<li class="chapter" data-level="2.3" data-path="dplyr-functions.html"><a href="dplyr-functions.html"><i class="fa fa-check"></i><b>2.3</b> 常用函数</a>
<ul>
<li class="chapter" data-level="2.3.1" data-path="dplyr-functions.html"><a href="dplyr-functions.html#条件判断"><i class="fa fa-check"></i><b>2.3.1</b> 条件判断</a></li>
<li class="chapter" data-level="2.3.2" data-path="dplyr-functions.html"><a href="dplyr-functions.html#case_when"><i class="fa fa-check"></i><b>2.3.2</b> case_when</a></li>
<li class="chapter" data-level="2.3.3" data-path="dplyr-functions.html"><a href="dplyr-functions.html#计数函数"><i class="fa fa-check"></i><b>2.3.3</b> 计数函数</a></li>
<li class="chapter" data-level="2.3.4" data-path="dplyr-functions.html"><a href="dplyr-functions.html#排序函数"><i class="fa fa-check"></i><b>2.3.4</b> 排序函数</a></li>
<li class="chapter" data-level="2.3.5" data-path="dplyr-functions.html"><a href="dplyr-functions.html#提取向量"><i class="fa fa-check"></i><b>2.3.5</b> 提取向量</a></li>
<li class="chapter" data-level="2.3.6" data-path="dplyr-functions.html"><a href="dplyr-functions.html#dplyr:slice"><i class="fa fa-check"></i><b>2.3.6</b> slice 系列</a></li>
<li class="chapter" data-level="2.3.7" data-path="dplyr-functions.html"><a href="dplyr-functions.html#group-系列"><i class="fa fa-check"></i><b>2.3.7</b> group 系列</a></li>
<li class="chapter" data-level="2.3.8" data-path="dplyr-functions.html"><a href="dplyr-functions.html#其它函数"><i class="fa fa-check"></i><b>2.3.8</b> 其它函数</a></li>
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<li class="chapter" data-level="2.4" data-path="dplyr-merge-two-table.html"><a href="dplyr-merge-two-table.html"><i class="fa fa-check"></i><b>2.4</b> 表关联</a>
<ul>
<li class="chapter" data-level="2.4.1" data-path="dplyr-merge-two-table.html"><a href="dplyr-merge-two-table.html#dplyr:merge-table-usage"><i class="fa fa-check"></i><b>2.4.1</b> 两表关联</a></li>
<li class="chapter" data-level="2.4.2" data-path="dplyr-merge-two-table.html"><a href="dplyr-merge-two-table.html#dplyr:merge-multiple-table"><i class="fa fa-check"></i><b>2.4.2</b> 多表操作</a></li>
</ul></li>
<li class="chapter" data-level="2.5" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html"><i class="fa fa-check"></i><b>2.5</b> 分组操作</a>
<ul>
<li class="chapter" data-level="2.5.1" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#添加分组"><i class="fa fa-check"></i><b>2.5.1</b> 添加分组</a></li>
<li class="chapter" data-level="2.5.2" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#查看分组"><i class="fa fa-check"></i><b>2.5.2</b> 查看分组</a></li>
<li class="chapter" data-level="2.5.3" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#更改和添加分组变量"><i class="fa fa-check"></i><b>2.5.3</b> 更改和添加分组变量</a></li>
<li class="chapter" data-level="2.5.4" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#删除分组变量"><i class="fa fa-check"></i><b>2.5.4</b> 删除分组变量</a></li>
<li class="chapter" data-level="2.5.5" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#动词影响"><i class="fa fa-check"></i><b>2.5.5</b> 动词影响</a></li>
</ul></li>
<li class="chapter" data-level="2.6" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html"><i class="fa fa-check"></i><b>2.6</b> 列操作</a>
<ul>
<li class="chapter" data-level="2.6.1" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html#dplyr-column-manipulation-basic-usage"><i class="fa fa-check"></i><b>2.6.1</b> 基础用法</a></li>
<li class="chapter" data-level="2.6.2" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html#多种函数功能"><i class="fa fa-check"></i><b>2.6.2</b> 多种函数功能</a></li>
<li class="chapter" data-level="2.6.3" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html#当前列"><i class="fa fa-check"></i><b>2.6.3</b> 当前列</a></li>
</ul></li>
<li class="chapter" data-level="2.7" data-path="dplyr-row-manipulation.html"><a href="dplyr-row-manipulation.html"><i class="fa fa-check"></i><b>2.7</b> 行操作</a>
<ul>
<li class="chapter" data-level="2.7.1" data-path="dplyr-row-manipulation.html"><a href="dplyr-row-manipulation.html#比较差异"><i class="fa fa-check"></i><b>2.7.1</b> 比较差异</a></li>
<li class="chapter" data-level="2.7.2" data-path="dplyr-row-manipulation.html"><a href="dplyr-row-manipulation.html#常用案例"><i class="fa fa-check"></i><b>2.7.2</b> 常用案例</a></li>
</ul></li>
<li class="chapter" data-level="2.8" data-path="dplyr-programming.html"><a href="dplyr-programming.html"><i class="fa fa-check"></i><b>2.8</b> <code>dplyr</code>编程</a>
<ul>
<li class="chapter" data-level="2.8.1" data-path="dplyr-programming.html"><a href="dplyr-programming.html#案例"><i class="fa fa-check"></i><b>2.8.1</b> 案例</a></li>
</ul></li>
<li class="chapter" data-level="2.9" data-path="dplyr-reference-material.html"><a href="dplyr-reference-material.html"><i class="fa fa-check"></i><b>2.9</b> 参考资料</a></li>
</ul></li>
<li class="chapter" data-level="3" data-path="Data-tidyr-package.html"><a href="Data-tidyr-package.html"><i class="fa fa-check"></i><b>3</b> 整洁数据之 tidyr</a>
<ul>
<li class="chapter" data-level="3.1" data-path="tidyr-useage.html"><a href="tidyr-useage.html"><i class="fa fa-check"></i><b>3.1</b> tidyr 介绍</a>
<ul>
<li class="chapter" data-level="3.1.1" data-path="tidyr-useage.html"><a href="tidyr-useage.html#tidyr:install"><i class="fa fa-check"></i><b>3.1.1</b> 安装</a></li>
<li class="chapter" data-level="3.1.2" data-path="tidyr-useage.html"><a href="tidyr-useage.html#tidyr:functions"><i class="fa fa-check"></i><b>3.1.2</b> 主要功能</a></li>
</ul></li>
<li class="chapter" data-level="3.2" data-path="pivoting.html"><a href="pivoting.html"><i class="fa fa-check"></i><b>3.2</b> 长宽转换</a>
<ul>
<li class="chapter" data-level="3.2.1" data-path="pivoting.html"><a href="pivoting.html#宽转长"><i class="fa fa-check"></i><b>3.2.1</b> 宽转长</a></li>
<li class="chapter" data-level="3.2.2" data-path="pivoting.html"><a href="pivoting.html#用法-1"><i class="fa fa-check"></i><b>3.2.2</b> 用法</a></li>
<li class="chapter" data-level="3.2.3" data-path="pivoting.html"><a href="pivoting.html#长转宽"><i class="fa fa-check"></i><b>3.2.3</b> 长转宽</a></li>
<li class="chapter" data-level="3.2.4" data-path="pivoting.html"><a href="pivoting.html#用法-2"><i class="fa fa-check"></i><b>3.2.4</b> 用法</a></li>
</ul></li>
<li class="chapter" data-level="3.3" data-path="tidyr-rectangle.html"><a href="tidyr-rectangle.html"><i class="fa fa-check"></i><b>3.3</b> 矩形数据</a></li>
<li class="chapter" data-level="3.4" data-path="tidyr-nest-data.html"><a href="tidyr-nest-data.html"><i class="fa fa-check"></i><b>3.4</b> 嵌套数据</a>
<ul>
<li class="chapter" data-level="3.4.1" data-path="tidyr-nest-data.html"><a href="tidyr-nest-data.html#基础"><i class="fa fa-check"></i><b>3.4.1</b> 基础</a></li>
<li class="chapter" data-level="3.4.2" data-path="tidyr-nest-data.html"><a href="tidyr-nest-data.html#嵌套数据和模型"><i class="fa fa-check"></i><b>3.4.2</b> 嵌套数据和模型</a></li>
</ul></li>
<li class="chapter" data-level="3.5" data-path="character-vector.html"><a href="character-vector.html"><i class="fa fa-check"></i><b>3.5</b> 字符处理</a>
<ul>
<li class="chapter" data-level="3.5.1" data-path="character-vector.html"><a href="character-vector.html#新列提取"><i class="fa fa-check"></i><b>3.5.1</b> 新列提取</a></li>
<li class="chapter" data-level="3.5.2" data-path="character-vector.html"><a href="character-vector.html#拆分"><i class="fa fa-check"></i><b>3.5.2</b> 拆分</a></li>
<li class="chapter" data-level="3.5.3" data-path="character-vector.html"><a href="character-vector.html#列拆分行"><i class="fa fa-check"></i><b>3.5.3</b> 列拆分行</a></li>
<li class="chapter" data-level="3.5.4" data-path="character-vector.html"><a href="character-vector.html#合并多列"><i class="fa fa-check"></i><b>3.5.4</b> 合并多列</a></li>
</ul></li>
<li class="chapter" data-level="3.6" data-path="tidyr-expand.html"><a href="tidyr-expand.html"><i class="fa fa-check"></i><b>3.6</b> 扩展数据框</a></li>
<li class="chapter" data-level="3.7" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html"><i class="fa fa-check"></i><b>3.7</b> 缺失值</a>
<ul>
<li class="chapter" data-level="3.7.1" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html#replace_na"><i class="fa fa-check"></i><b>3.7.1</b> replace_na</a></li>
<li class="chapter" data-level="3.7.2" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html#fill"><i class="fa fa-check"></i><b>3.7.2</b> fill</a></li>
<li class="chapter" data-level="3.7.3" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html#drop_na"><i class="fa fa-check"></i><b>3.7.3</b> drop_na</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="4" data-path="character-handling.html"><a href="character-handling.html"><i class="fa fa-check"></i><b>4</b> 字符处理</a>
<ul>
<li class="chapter" data-level="4.1" data-path="character-base-R.html"><a href="character-base-R.html"><i class="fa fa-check"></i><b>4.1</b> base R</a>
<ul>
<li class="chapter" data-level="4.1.1" data-path="character-base-R.html"><a href="character-base-R.html#单双引号"><i class="fa fa-check"></i><b>4.1.1</b> 单双引号</a></li>
<li class="chapter" data-level="4.1.2" data-path="character-base-R.html"><a href="character-base-R.html#转义"><i class="fa fa-check"></i><b>4.1.2</b> 转义</a></li>
<li class="chapter" data-level="4.1.3" data-path="character-base-R.html"><a href="character-base-R.html#常用函数"><i class="fa fa-check"></i><b>4.1.3</b> 常用函数</a></li>
<li class="chapter" data-level="4.1.4" data-path="character-base-R.html"><a href="character-base-R.html#newfeatures"><i class="fa fa-check"></i><b>4.1.4</b> 新特性</a></li>
</ul></li>
<li class="chapter" data-level="4.2" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html"><i class="fa fa-check"></i><b>4.2</b> stringr</a>
<ul>
<li class="chapter" data-level="4.2.1" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html#stringr-install"><i class="fa fa-check"></i><b>4.2.1</b> 安装</a></li>
<li class="chapter" data-level="4.2.2" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html#stringr-usage"><i class="fa fa-check"></i><b>4.2.2</b> 基本使用</a></li>
<li class="chapter" data-level="4.2.3" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html#stringr-functions"><i class="fa fa-check"></i><b>4.2.3</b> 常用函数</a></li>
</ul></li>
<li class="chapter" data-level="4.3" data-path="character-application.html"><a href="character-application.html"><i class="fa fa-check"></i><b>4.3</b> 综合运用</a>
<ul>
<li class="chapter" data-level="4.3.1" data-path="character-application.html"><a href="character-application.html#实现excel函数"><i class="fa fa-check"></i><b>4.3.1</b> 实现excel函数</a></li>
<li class="chapter" data-level="4.3.2" data-path="character-application.html"><a href="character-application.html#使用案例"><i class="fa fa-check"></i><b>4.3.2</b> 使用案例</a></li>
</ul></li>
<li class="chapter" data-level="4.4" data-path="character-the-difference-stringr-and-base.html"><a href="character-the-difference-stringr-and-base.html"><i class="fa fa-check"></i><b>4.4</b> base 和 stringr</a></li>
<li class="chapter" data-level="4.5" data-path="character-reference-material.html"><a href="character-reference-material.html"><i class="fa fa-check"></i><b>4.5</b> 参考资料</a></li>
</ul></li>
<li class="chapter" data-level="5" data-path="datetime.html"><a href="datetime.html"><i class="fa fa-check"></i><b>5</b> 时间处理</a>
<ul>
<li class="chapter" data-level="5.1" data-path="datetime-base-R.html"><a href="datetime-base-R.html"><i class="fa fa-check"></i><b>5.1</b> base R</a>
<ul>
<li class="chapter" data-level="5.1.1" data-path="datetime-base-R.html"><a href="datetime-base-R.html#the-date-class"><i class="fa fa-check"></i><b>5.1.1</b> Date</a></li>
<li class="chapter" data-level="5.1.2" data-path="datetime-base-R.html"><a href="datetime-base-R.html#the-POSIXct-class"><i class="fa fa-check"></i><b>5.1.2</b> POSIXct</a></li>
<li class="chapter" data-level="5.1.3" data-path="datetime-base-R.html"><a href="datetime-base-R.html#the-POSIXlt-class"><i class="fa fa-check"></i><b>5.1.3</b> POSIXlt</a></li>
</ul></li>
<li class="chapter" data-level="5.2" data-path="lubridate.html"><a href="lubridate.html"><i class="fa fa-check"></i><b>5.2</b> lubridate</a>
<ul>
<li class="chapter" data-level="5.2.1" data-path="lubridate.html"><a href="lubridate.html#lubridate-install"><i class="fa fa-check"></i><b>5.2.1</b> 安装包</a></li>
<li class="chapter" data-level="5.2.2" data-path="lubridate.html"><a href="lubridate.html#get-current-datetime"><i class="fa fa-check"></i><b>5.2.2</b> 当前时间日期</a></li>
<li class="chapter" data-level="5.2.3" data-path="lubridate.html"><a href="lubridate.html#make-datetime"><i class="fa fa-check"></i><b>5.2.3</b> 构造日期时间</a></li>
<li class="chapter" data-level="5.2.4" data-path="lubridate.html"><a href="lubridate.html#parse-datetime"><i class="fa fa-check"></i><b>5.2.4</b> 解析日期时间</a></li>
<li class="chapter" data-level="5.2.5" data-path="lubridate.html"><a href="lubridate.html#extracting-datetime-information"><i class="fa fa-check"></i><b>5.2.5</b> 提取日期时间成分</a></li>
<li class="chapter" data-level="5.2.6" data-path="lubridate.html"><a href="lubridate.html#time-zones"><i class="fa fa-check"></i><b>5.2.6</b> 处理时区</a></li>
<li class="chapter" data-level="5.2.7" data-path="lubridate.html"><a href="lubridate.html#interveal"><i class="fa fa-check"></i><b>5.2.7</b> 时间间隔</a></li>
<li class="chapter" data-level="5.2.8" data-path="lubridate.html"><a href="lubridate.html#calculate-datetime"><i class="fa fa-check"></i><b>5.2.8</b> 时间日期计算</a></li>
</ul></li>
<li class="chapter" data-level="5.3" data-path="datetime-application.html"><a href="datetime-application.html"><i class="fa fa-check"></i><b>5.3</b> 综合运用</a>
<ul>
<li class="chapter" data-level="5.3.1" data-path="datetime-application.html"><a href="datetime-application.html#日报同环比计算"><i class="fa fa-check"></i><b>5.3.1</b> 日报同环比计算</a></li>
<li class="chapter" data-level="5.3.2" data-path="datetime-application.html"><a href="datetime-application.html#清洗不同类型日期格式"><i class="fa fa-check"></i><b>5.3.2</b> 清洗不同类型日期格式</a></li>
<li class="chapter" data-level="5.3.3" data-path="datetime-application.html"><a href="datetime-application.html#扫码后中奖时间匹配"><i class="fa fa-check"></i><b>5.3.3</b> 扫码后中奖时间匹配</a></li>
</ul></li>
<li class="chapter" data-level="5.4" data-path="datetime-additional-information.html"><a href="datetime-additional-information.html"><i class="fa fa-check"></i><b>5.4</b> 补充资料</a>
<ul>
<li class="chapter" data-level="5.4.1" data-path="datetime-additional-information.html"><a href="datetime-additional-information.html#excel-and-r"><i class="fa fa-check"></i><b>5.4.1</b> Excel and R</a></li>
<li class="chapter" data-level="5.4.2" data-path="datetime-additional-information.html"><a href="datetime-additional-information.html#参考资料-1"><i class="fa fa-check"></i><b>5.4.2</b> 参考资料</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="6" data-path="forcats.html"><a href="forcats.html"><i class="fa fa-check"></i><b>6</b> 因子介绍</a>
<ul>
<li class="chapter" data-level="6.1" data-path="forcats-introduction.html"><a href="forcats-introduction.html"><i class="fa fa-check"></i><b>6.1</b> 介绍</a>
<ul>
<li class="chapter" data-level="6.1.1" data-path="forcats-introduction.html"><a href="forcats-introduction.html#forcats:install"><i class="fa fa-check"></i><b>6.1.1</b> 安装</a></li>
</ul></li>
<li class="chapter" data-level="6.2" data-path="forcats-usage.html"><a href="forcats-usage.html"><i class="fa fa-check"></i><b>6.2</b> 用法</a>
<ul>
<li class="chapter" data-level="6.2.1" data-path="forcats-usage.html"><a href="forcats-usage.html#创建因子"><i class="fa fa-check"></i><b>6.2.1</b> 创建因子</a></li>
<li class="chapter" data-level="6.2.2" data-path="forcats-usage.html"><a href="forcats-usage.html#修改因子顺序"><i class="fa fa-check"></i><b>6.2.2</b> 修改因子顺序</a></li>
<li class="chapter" data-level="6.2.3" data-path="forcats-usage.html"><a href="forcats-usage.html#修改因子级别"><i class="fa fa-check"></i><b>6.2.3</b> 修改因子级别</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="7" data-path="Data-Manipulation-datatable.html"><a href="Data-Manipulation-datatable.html"><i class="fa fa-check"></i><b>7</b> data.table</a>
<ul>
<li class="chapter" data-level="7.1" data-path="datatable-description.html"><a href="datatable-description.html"><i class="fa fa-check"></i><b>7.1</b> 基础介绍</a>
<ul>
<li class="chapter" data-level="7.1.1" data-path="datatable-description.html"><a href="datatable-description.html#读取数据"><i class="fa fa-check"></i><b>7.1.1</b> 读取数据</a></li>
<li class="chapter" data-level="7.1.2" data-path="datatable-description.html"><a href="datatable-description.html#基本格式"><i class="fa fa-check"></i><b>7.1.2</b> 基本格式</a></li>
<li class="chapter" data-level="7.1.3" data-path="datatable-description.html"><a href="datatable-description.html#i-j-by-使用"><i class="fa fa-check"></i><b>7.1.3</b> i j by 使用</a></li>
<li class="chapter" data-level="7.1.4" data-path="datatable-description.html"><a href="datatable-description.html#行列筛选总结"><i class="fa fa-check"></i><b>7.1.4</b> 行列筛选总结</a></li>
</ul></li>
<li class="chapter" data-level="7.2" data-path="datatable-usage.html"><a href="datatable-usage.html"><i class="fa fa-check"></i><b>7.2</b> 常规操作</a>
<ul>
<li class="chapter" data-level="7.2.1" data-path="datatable-usage.html"><a href="datatable-usage.html#行筛选"><i class="fa fa-check"></i><b>7.2.1</b> 行筛选</a></li>
<li class="chapter" data-level="7.2.2" data-path="datatable-usage.html"><a href="datatable-usage.html#新增更新列"><i class="fa fa-check"></i><b>7.2.2</b> 新增更新列</a></li>
<li class="chapter" data-level="7.2.3" data-path="datatable-usage.html"><a href="datatable-usage.html#排序"><i class="fa fa-check"></i><b>7.2.3</b> 排序</a></li>
</ul></li>
<li class="chapter" data-level="7.3" data-path="datatable-function.html"><a href="datatable-function.html"><i class="fa fa-check"></i><b>7.3</b> 常用函数</a>
<ul>
<li class="chapter" data-level="7.3.1" data-path="datatable-function.html"><a href="datatable-function.html#特殊符号"><i class="fa fa-check"></i><b>7.3.1</b> 特殊符号</a></li>
<li class="chapter" data-level="7.3.2" data-path="datatable-function.html"><a href="datatable-function.html#排序函数-1"><i class="fa fa-check"></i><b>7.3.2</b> 排序函数</a></li>
<li class="chapter" data-level="7.3.3" data-path="datatable-function.html"><a href="datatable-function.html#非重复计数"><i class="fa fa-check"></i><b>7.3.3</b> 非重复计数</a></li>
<li class="chapter" data-level="7.3.4" data-path="datatable-function.html"><a href="datatable-function.html#判断函数"><i class="fa fa-check"></i><b>7.3.4</b> 判断函数</a></li>
<li class="chapter" data-level="7.3.5" data-path="datatable-function.html"><a href="datatable-function.html#交集-差集-合并"><i class="fa fa-check"></i><b>7.3.5</b> 交集 差集 合并</a></li>
<li class="chapter" data-level="7.3.6" data-path="datatable-function.html"><a href="datatable-function.html#长宽转换"><i class="fa fa-check"></i><b>7.3.6</b> 长宽转换</a></li>
<li class="chapter" data-level="7.3.7" data-path="datatable-function.html"><a href="datatable-function.html#表连接"><i class="fa fa-check"></i><b>7.3.7</b> 表连接</a></li>
</ul></li>
<li class="chapter" data-level="7.4" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html"><i class="fa fa-check"></i><b>7.4</b> 高级函数</a>
<ul>
<li class="chapter" data-level="7.4.1" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#groupingsets"><i class="fa fa-check"></i><b>7.4.1</b> groupingsets</a></li>
<li class="chapter" data-level="7.4.2" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#rleid"><i class="fa fa-check"></i><b>7.4.2</b> rleid</a></li>
<li class="chapter" data-level="7.4.3" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#shift"><i class="fa fa-check"></i><b>7.4.3</b> shift</a></li>
<li class="chapter" data-level="7.4.4" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#j"><i class="fa fa-check"></i><b>7.4.4</b> J</a></li>
</ul></li>
<li class="chapter" data-level="7.5" data-path="datatable-tips.html"><a href="datatable-tips.html"><i class="fa fa-check"></i><b>7.5</b> 小技巧</a>
<ul>
<li class="chapter" data-level="7.5.1" data-path="datatable-tips.html"><a href="datatable-tips.html#用抑制中间过程输出"><i class="fa fa-check"></i><b>7.5.1</b> 用{}抑制中间过程输出</a></li>
<li class="chapter" data-level="7.5.2" data-path="datatable-tips.html"><a href="datatable-tips.html#使用打印data.table"><i class="fa fa-check"></i><b>7.5.2</b> 使用[]打印data.table</a></li>
</ul></li>
<li class="chapter" data-level="7.6" data-path="datatable-application.html"><a href="datatable-application.html"><i class="fa fa-check"></i><b>7.6</b> 运用</a>
<ul>
<li class="chapter" data-level="7.6.1" data-path="datatable-application.html"><a href="datatable-application.html#自定义函数计算"><i class="fa fa-check"></i><b>7.6.1</b> 自定义函数计算</a></li>
<li class="chapter" data-level="7.6.2" data-path="datatable-application.html"><a href="datatable-application.html#带汇总的聚合运算"><i class="fa fa-check"></i><b>7.6.2</b> 带汇总的聚合运算</a></li>
<li class="chapter" data-level="7.6.3" data-path="datatable-application.html"><a href="datatable-application.html#行列转变"><i class="fa fa-check"></i><b>7.6.3</b> 行列转变</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="8" data-path="database.html"><a href="database.html"><i class="fa fa-check"></i><b>8</b> database</a>
<ul>
<li class="chapter" data-level="8.1" data-path="database-install.html"><a href="database-install.html"><i class="fa fa-check"></i><b>8.1</b> 安装数据库</a></li>
<li class="chapter" data-level="8.2" data-path="database-odbc-package.html"><a href="database-odbc-package.html"><i class="fa fa-check"></i><b>8.2</b> odbc包</a>
<ul>
<li class="chapter" data-level="8.2.1" data-path="database-odbc-package.html"><a href="database-odbc-package.html#安装包"><i class="fa fa-check"></i><b>8.2.1</b> 安装包</a></li>
<li class="chapter" data-level="8.2.2" data-path="database-odbc-package.html"><a href="database-odbc-package.html#驱动安装"><i class="fa fa-check"></i><b>8.2.2</b> 驱动安装</a></li>
<li class="chapter" data-level="8.2.3" data-path="database-odbc-package.html"><a href="database-odbc-package.html#连接数据库"><i class="fa fa-check"></i><b>8.2.3</b> 连接数据库</a></li>
<li class="chapter" data-level="8.2.4" data-path="database-odbc-package.html"><a href="database-odbc-package.html#读写数据库"><i class="fa fa-check"></i><b>8.2.4</b> 读写数据库</a></li>
</ul></li>
<li class="chapter" data-level="8.3" data-path="database-DBI-package.html"><a href="database-DBI-package.html"><i class="fa fa-check"></i><b>8.3</b> DBI包</a>
<ul>
<li class="chapter" data-level="8.3.1" data-path="database-DBI-package.html"><a href="database-DBI-package.html#安装-1"><i class="fa fa-check"></i><b>8.3.1</b> 安装</a></li>
<li class="chapter" data-level="8.3.2" data-path="database-DBI-package.html"><a href="database-DBI-package.html#连接数据库-1"><i class="fa fa-check"></i><b>8.3.2</b> 连接数据库</a></li>
<li class="chapter" data-level="8.3.3" data-path="database-DBI-package.html"><a href="database-DBI-package.html#读写数据库-1"><i class="fa fa-check"></i><b>8.3.3</b> 读写数据库</a></li>
<li class="chapter" data-level="8.3.4" data-path="database-DBI-package.html"><a href="database-DBI-package.html#其它函数介绍"><i class="fa fa-check"></i><b>8.3.4</b> 其它函数介绍</a></li>
</ul></li>
<li class="chapter" data-level="8.4" data-path="database-else-package.html"><a href="database-else-package.html"><i class="fa fa-check"></i><b>8.4</b> 其他R包</a>
<ul>
<li class="chapter" data-level="8.4.1" data-path="database-else-package.html"><a href="database-else-package.html#rodbc包"><i class="fa fa-check"></i><b>8.4.1</b> RODBC包</a></li>
<li class="chapter" data-level="8.4.2" data-path="database-else-package.html"><a href="database-else-package.html#roracle包"><i class="fa fa-check"></i><b>8.4.2</b> ROracle包</a></li>
<li class="chapter" data-level="8.4.3" data-path="database-else-package.html"><a href="database-else-package.html#rmysql包"><i class="fa fa-check"></i><b>8.4.3</b> RMySQL包</a></li>
<li class="chapter" data-level="8.4.4" data-path="database-else-package.html"><a href="database-else-package.html#rsqlite"><i class="fa fa-check"></i><b>8.4.4</b> RSQLite</a></li>
</ul></li>
<li class="chapter" data-level="8.5" data-path="database-big-data.html"><a href="database-big-data.html"><i class="fa fa-check"></i><b>8.5</b> 大数据相关R包</a>
<ul>
<li class="chapter" data-level="8.5.1" data-path="database-big-data.html"><a href="database-big-data.html#sparklyr"><i class="fa fa-check"></i><b>8.5.1</b> sparklyr</a></li>
<li class="chapter" data-level="8.5.2" data-path="database-big-data.html"><a href="database-big-data.html#RClickhouse"><i class="fa fa-check"></i><b>8.5.2</b> RClickhouse</a></li>
</ul></li>
<li class="chapter" data-level="8.6" data-path="database-FAQ.html"><a href="database-FAQ.html"><i class="fa fa-check"></i><b>8.6</b> 常见问题</a>
<ul>
<li class="chapter" data-level="8.6.1" data-path="database-FAQ.html"><a href="database-FAQ.html#乱码问题"><i class="fa fa-check"></i><b>8.6.1</b> 乱码问题</a></li>
<li class="chapter" data-level="8.6.2" data-path="database-FAQ.html"><a href="database-FAQ.html#无法连接问题"><i class="fa fa-check"></i><b>8.6.2</b> 无法连接问题</a></li>
<li class="chapter" data-level="8.6.3" data-path="database-FAQ.html"><a href="database-FAQ.html#远程连接"><i class="fa fa-check"></i><b>8.6.3</b> 远程连接</a></li>
<li class="chapter" data-level="8.6.4" data-path="database-FAQ.html"><a href="database-FAQ.html#跳板机连接"><i class="fa fa-check"></i><b>8.6.4</b> 跳板机连接</a></li>
</ul></li>
<li class="chapter" data-level="8.7" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html"><i class="fa fa-check"></i><b>8.7</b> dbplyr</a>
<ul>
<li class="chapter" data-level="8.7.1" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html#安装-2"><i class="fa fa-check"></i><b>8.7.1</b> 安装</a></li>
<li class="chapter" data-level="8.7.2" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html#基础用法-1"><i class="fa fa-check"></i><b>8.7.2</b> 基础用法</a></li>
<li class="chapter" data-level="8.7.3" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html#无法正确转化"><i class="fa fa-check"></i><b>8.7.3</b> 无法正确转化</a></li>
</ul></li>
<li class="chapter" data-level="8.8" data-path="database-reference-material.html"><a href="database-reference-material.html"><i class="fa fa-check"></i><b>8.8</b> 参考资料</a></li>
</ul></li>
<li class="chapter" data-level="9" data-path="R-loop-structure.html"><a href="R-loop-structure.html"><i class="fa fa-check"></i><b>9</b> 循环结构</a>
<ul>
<li class="chapter" data-level="9.1" data-path="R-loop-description.html"><a href="R-loop-description.html"><i class="fa fa-check"></i><b>9.1</b> R循环介绍</a>
<ul>
<li class="chapter" data-level="9.1.1" data-path="R-loop-description.html"><a href="R-loop-description.html#R:loop-example"><i class="fa fa-check"></i><b>9.1.1</b> 简单示例</a></li>
<li class="chapter" data-level="9.1.2" data-path="R-loop-description.html"><a href="R-loop-description.html#three:loop-structure"><i class="fa fa-check"></i><b>9.1.2</b> 循环结构</a></li>
<li class="chapter" data-level="9.1.3" data-path="R-loop-description.html"><a href="R-loop-description.html#loop:control"><i class="fa fa-check"></i><b>9.1.3</b> 循环控制</a></li>
<li class="chapter" data-level="9.1.4" data-path="R-loop-description.html"><a href="R-loop-description.html#嵌套循环"><i class="fa fa-check"></i><b>9.1.4</b> 嵌套循环</a></li>
</ul></li>
<li class="chapter" data-level="9.2" data-path="loop-changes.html"><a href="loop-changes.html"><i class="fa fa-check"></i><b>9.2</b> 循环变化</a>
<ul>
<li class="chapter" data-level="9.2.1" data-path="loop-changes.html"><a href="loop-changes.html#修改已有对象"><i class="fa fa-check"></i><b>9.2.1</b> 修改已有对象</a></li>
<li class="chapter" data-level="9.2.2" data-path="loop-changes.html"><a href="loop-changes.html#循环模式"><i class="fa fa-check"></i><b>9.2.2</b> 循环模式</a></li>
<li class="chapter" data-level="9.2.3" data-path="loop-changes.html"><a href="loop-changes.html#未知长度输出"><i class="fa fa-check"></i><b>9.2.3</b> 未知长度输出</a></li>
</ul></li>
<li class="chapter" data-level="9.3" data-path="apply-function.html"><a href="apply-function.html"><i class="fa fa-check"></i><b>9.3</b> apply系列函数</a>
<ul>
<li class="chapter" data-level="9.3.1" data-path="apply-function.html"><a href="apply-function.html#lapply"><i class="fa fa-check"></i><b>9.3.1</b> lapply 循环迭代</a></li>
<li class="chapter" data-level="9.3.2" data-path="apply-function.html"><a href="apply-function.html#sapply"><i class="fa fa-check"></i><b>9.3.2</b> sapply</a></li>
<li class="chapter" data-level="9.3.3" data-path="apply-function.html"><a href="apply-function.html#vapply"><i class="fa fa-check"></i><b>9.3.3</b> vapply 迭代安全函数</a></li>
<li class="chapter" data-level="9.3.4" data-path="apply-function.html"><a href="apply-function.html#apply"><i class="fa fa-check"></i><b>9.3.4</b> apply 多维数据</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="10" data-path="purrr-Iteration.html"><a href="purrr-Iteration.html"><i class="fa fa-check"></i><b>10</b> 循环迭代purrr介绍</a>
<ul>
<li class="chapter" data-level="10.1" data-path="安装-3.html"><a href="安装-3.html"><i class="fa fa-check"></i><b>10.1</b> 安装</a></li>
<li class="chapter" data-level="10.2" data-path="purrr-basic-usage.html"><a href="purrr-basic-usage.html"><i class="fa fa-check"></i><b>10.2</b> 常规用法</a>
<ul>
<li class="chapter" data-level="10.2.1" data-path="purrr-basic-usage.html"><a href="purrr-basic-usage.html#map-系列"><i class="fa fa-check"></i><b>10.2.1</b> map 系列</a></li>
<li class="chapter" data-level="10.2.2" data-path="purrr-basic-usage.html"><a href="purrr-basic-usage.html#pmap-系列"><i class="fa fa-check"></i><b>10.2.2</b> pmap 系列</a></li>
</ul></li>
<li class="chapter" data-level="10.3" data-path="purrr-map.html"><a href="purrr-map.html"><i class="fa fa-check"></i><b>10.3</b> map系列函数</a>
<ul>
<li class="chapter" data-level="10.3.1" data-path="purrr-map.html"><a href="purrr-map.html#用法-3"><i class="fa fa-check"></i><b>10.3.1</b> 用法</a></li>
<li class="chapter" data-level="10.3.2" data-path="purrr-map.html"><a href="purrr-map.html#案例-5"><i class="fa fa-check"></i><b>10.3.2</b> 案例</a></li>
</ul></li>
<li class="chapter" data-level="10.4" data-path="purrr-map2.html"><a href="purrr-map2.html"><i class="fa fa-check"></i><b>10.4</b> map2 系列函数</a></li>
<li class="chapter" data-level="10.5" data-path="purrr-multi-parameter.html"><a href="purrr-multi-parameter.html"><i class="fa fa-check"></i><b>10.5</b> pmap系列函数</a></li>
<li class="chapter" data-level="10.6" data-path="purrr-reduce.html"><a href="purrr-reduce.html"><i class="fa fa-check"></i><b>10.6</b> 归约累计函数</a>
<ul>
<li class="chapter" data-level="10.6.1" data-path="purrr-reduce.html"><a href="purrr-reduce.html#reduce-函数"><i class="fa fa-check"></i><b>10.6.1</b> reduce 函数</a></li>
<li class="chapter" data-level="10.6.2" data-path="purrr-reduce.html"><a href="purrr-reduce.html#accumulate-函数"><i class="fa fa-check"></i><b>10.6.2</b> accumulate 函数</a></li>
</ul></li>
<li class="chapter" data-level="10.7" data-path="purrr-safely-functions.html"><a href="purrr-safely-functions.html"><i class="fa fa-check"></i><b>10.7</b> 安全函数</a></li>
<li class="chapter" data-level="10.8" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html"><i class="fa fa-check"></i><b>10.8</b> 其他函数介绍</a>
<ul>
<li class="chapter" data-level="10.8.1" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#flatten-系列"><i class="fa fa-check"></i><b>10.8.1</b> flatten 系列</a></li>
<li class="chapter" data-level="10.8.2" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#imap-函数"><i class="fa fa-check"></i><b>10.8.2</b> imap 函数</a></li>
<li class="chapter" data-level="10.8.3" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#walk-系列"><i class="fa fa-check"></i><b>10.8.3</b> walk 系列</a></li>
<li class="chapter" data-level="10.8.4" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#逻辑判断函数"><i class="fa fa-check"></i><b>10.8.4</b> 逻辑判断函数</a></li>
<li class="chapter" data-level="10.8.5" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#提取函数"><i class="fa fa-check"></i><b>10.8.5</b> 提取函数</a></li>
<li class="chapter" data-level="10.8.6" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#筛选函数"><i class="fa fa-check"></i><b>10.8.6</b> 筛选函数</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="11" data-path="self-define-function.html"><a href="self-define-function.html"><i class="fa fa-check"></i><b>11</b> 自定义函数</a>
<ul>
<li class="chapter" data-level="11.1" data-path="define-function-example.html"><a href="define-function-example.html"><i class="fa fa-check"></i><b>11.1</b> 简单示例</a></li>
<li class="chapter" data-level="11.2" data-path="define-function-conditional-execution.html"><a href="define-function-conditional-execution.html"><i class="fa fa-check"></i><b>11.2</b> 条件执行</a>
<ul>
<li class="chapter" data-level="11.2.1" data-path="define-function-conditional-execution.html"><a href="define-function-conditional-execution.html#多条件执行"><i class="fa fa-check"></i><b>11.2.1</b> 多条件执行</a></li>
</ul></li>
<li class="chapter" data-level="11.3" data-path="define-function-parameter.html"><a href="define-function-parameter.html"><i class="fa fa-check"></i><b>11.3</b> 函数参数</a>
<ul>
<li class="chapter" data-level="11.3.1" data-path="define-function-parameter.html"><a href="define-function-parameter.html#参数名称"><i class="fa fa-check"></i><b>11.3.1</b> 参数名称</a></li>
<li class="chapter" data-level="11.3.2" data-path="define-function-parameter.html"><a href="define-function-parameter.html#检查参数值"><i class="fa fa-check"></i><b>11.3.2</b> 检查参数值</a></li>
<li class="chapter" data-level="11.3.3" data-path="define-function-parameter.html"><a href="define-function-parameter.html#参数-5"><i class="fa fa-check"></i><b>11.3.3</b> …参数</a></li>
</ul></li>
<li class="chapter" data-level="11.4" data-path="function-return.html"><a href="function-return.html"><i class="fa fa-check"></i><b>11.4</b> 返回值</a>
<ul>
<li class="chapter" data-level="11.4.1" data-path="function-return.html"><a href="function-return.html#显式返回"><i class="fa fa-check"></i><b>11.4.1</b> 显式返回</a></li>
<li class="chapter" data-level="11.4.2" data-path="function-return.html"><a href="function-return.html#编写管道函数"><i class="fa fa-check"></i><b>11.4.2</b> 编写管道函数</a></li>
</ul></li>
<li class="chapter" data-level="11.5" data-path="function-environment.html"><a href="function-environment.html"><i class="fa fa-check"></i><b>11.5</b> 环境</a></li>
<li class="chapter" data-level="11.6" data-path="function-expand.html"><a href="function-expand.html"><i class="fa fa-check"></i><b>11.6</b> 拓展部分</a></li>
</ul></li>
<li class="chapter" data-level="12" data-path="file-system-operation.html"><a href="file-system-operation.html"><i class="fa fa-check"></i><b>12</b> R语言文件系统操作</a>
<ul>
<li class="chapter" data-level="12.1" data-path="file-base-r.html"><a href="file-base-r.html"><i class="fa fa-check"></i><b>12.1</b> base R</a>
<ul>
<li class="chapter" data-level="12.1.1" data-path="file-base-r.html"><a href="file-base-r.html#base:r-usage"><i class="fa fa-check"></i><b>12.1.1</b> 用法</a></li>
</ul></li>
<li class="chapter" data-level="12.2" data-path="fs-package.html"><a href="fs-package.html"><i class="fa fa-check"></i><b>12.2</b> fs package</a>
<ul>
<li class="chapter" data-level="12.2.1" data-path="fs-package.html"><a href="fs-package.html#fs-install"><i class="fa fa-check"></i><b>12.2.1</b> 安装</a></li>
<li class="chapter" data-level="12.2.2" data-path="fs-package.html"><a href="fs-package.html#fs-advanced"><i class="fa fa-check"></i><b>12.2.2</b> 优势</a></li>
<li class="chapter" data-level="12.2.3" data-path="fs-package.html"><a href="fs-package.html#fs-usage"><i class="fa fa-check"></i><b>12.2.3</b> 基础用法</a></li>
</ul></li>
<li class="chapter" data-level="12.3" data-path="fs-functions.html"><a href="fs-functions.html"><i class="fa fa-check"></i><b>12.3</b> fs函数介绍</a>
<ul>
<li class="chapter" data-level="12.3.1" data-path="fs-functions.html"><a href="fs-functions.html#fs-file-manipulation"><i class="fa fa-check"></i><b>12.3.1</b> 文件操作</a></li>
<li class="chapter" data-level="12.3.2" data-path="fs-functions.html"><a href="fs-functions.html#fs-dir-manipulation"><i class="fa fa-check"></i><b>12.3.2</b> 目录操作</a></li>
<li class="chapter" data-level="12.3.3" data-path="fs-functions.html"><a href="fs-functions.html#fs-link-manipulation"><i class="fa fa-check"></i><b>12.3.3</b> 链接操作</a></li>
<li class="chapter" data-level="12.3.4" data-path="fs-functions.html"><a href="fs-functions.html#fs-path-manipulation"><i class="fa fa-check"></i><b>12.3.4</b> 路径操作</a></li>
<li class="chapter" data-level="12.3.5" data-path="fs-functions.html"><a href="fs-functions.html#fs-help-manipulation"><i class="fa fa-check"></i><b>12.3.5</b> 辅助函数</a></li>
</ul></li>
<li class="chapter" data-level="12.4" data-path="file-base-fs-difference.html"><a href="file-base-fs-difference.html"><i class="fa fa-check"></i><b>12.4</b> base-fs-shell比较</a></li>
<li class="chapter" data-level="12.5" data-path="file-manipulation-reference-material.html"><a href="file-manipulation-reference-material.html"><i class="fa fa-check"></i><b>12.5</b> 参考资料</a></li>
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<li><a href="https://gitee.com/zhongyufei/Rbook" target="blank">gitee地址</a></li>

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<div id="readxl:description" class="section level2" number="1.1">
<h2><span class="header-section-number">1.1</span> readxl</h2>
<p>readxl 软件包使 R 获取 Excel 数据变得方便简洁。与现有的软件包(例如：xlsx)相比，readxl 没有外部依赖性，xlsx 等包依赖 java 环境。readxl 包容易在所有的操作系统安装使用。</p>
<p>readxl<a href="https://readxl.tidyverse.org/">项目地址</a>，本节大部分代码来源项目官网介绍，可自行查阅官网。</p>
<div id="readxl:install" class="section level3" number="1.1.1">
<h3><span class="header-section-number">1.1.1</span> 安装</h3>
<p>从 CRAN 安装最新发行版本的最简单方法是安装整个 tidyverse。</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="readxl-description.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="fu">install.packages</span>(<span class="st">&quot;tidyverse&quot;</span>)</span></code></pre></div>
<blockquote>
<p>由于readxl不是tidyverse核心加载包，使用时仅需加载library(readxl)</p>
</blockquote>
<p>或者是从CRAN仅安装readxl;</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb3-1"><a href="readxl-description.html#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="fu">install.packages</span>(<span class="st">&quot;readxl&quot;</span>)</span></code></pre></div>
<p>从github安装开发版：</p>
<div class="sourceCode" id="cb4"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb4-1"><a href="readxl-description.html#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="co"># install.packages(&quot;devtools&quot;)</span></span>
<span id="cb4-2"><a href="readxl-description.html#cb4-2" aria-hidden="true" tabindex="-1"></a>devtools<span class="sc">::</span><span class="fu">install_github</span>(<span class="st">&quot;tidyverse/readxl&quot;</span>)</span></code></pre></div>
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<div id="readxl:usage" class="section level3" number="1.1.2">
<h3><span class="header-section-number">1.1.2</span> 用法</h3>
<p>readxl 包的核心函数是读取函数<code>read_excel()</code>，该函数能将 Excel 文件数据加载到R中。readxl 包中包含了几个示例文件，我们在接下来的案例中使用。</p>
<p>1.读取</p>
<p>通过<code>readxl_example()</code>查看 readxl 包中自带 xlsx 文件。</p>
<div class="sourceCode" id="cb5"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb5-1"><a href="readxl-description.html#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(readxl)</span>
<span id="cb5-2"><a href="readxl-description.html#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="fu">readxl_example</span>()</span>
<span id="cb5-3"><a href="readxl-description.html#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  [1] &quot;clippy.xls&quot;    &quot;clippy.xlsx&quot;   &quot;datasets.xls&quot;  &quot;datasets.xlsx&quot;</span></span>
<span id="cb5-4"><a href="readxl-description.html#cb5-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  [5] &quot;deaths.xls&quot;    &quot;deaths.xlsx&quot;   &quot;geometry.xls&quot;  &quot;geometry.xlsx&quot;</span></span>
<span id="cb5-5"><a href="readxl-description.html#cb5-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  [9] &quot;type-me.xls&quot;   &quot;type-me.xlsx&quot;</span></span>
<span id="cb5-6"><a href="readxl-description.html#cb5-6" aria-hidden="true" tabindex="-1"></a><span class="fu">readxl_example</span>(<span class="st">&quot;clippy.xls&quot;</span>)</span>
<span id="cb5-7"><a href="readxl-description.html#cb5-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; [1] &quot;C:/R/R-4.1.0/library/readxl/extdata/clippy.xls&quot;</span></span></code></pre></div>
<p>需要注意<code>read_excel()</code>可读取 xls 和 xlsx 文件，函数会自动识别。</p>
<blockquote>
<p>xls 和 xlsx 的区别: xls 是 excel2003 及以前版本生成的文件格式，而 xlsx 是 excel2007 及以后版本生成的文件格式。xlsx 格式是向下兼容的，可兼容 xls 格式。老旧的业务使用的格式可能是 xls 格式。</p>
</blockquote>
<div class="sourceCode" id="cb6"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb6-1"><a href="readxl-description.html#cb6-1" aria-hidden="true" tabindex="-1"></a>xlsx_example <span class="ot">&lt;-</span> <span class="fu">readxl_example</span>(<span class="st">&quot;datasets.xlsx&quot;</span>) <span class="co">#返回 datasets.xlsx文件所在路径</span></span>
<span id="cb6-2"><a href="readxl-description.html#cb6-2" aria-hidden="true" tabindex="-1"></a>dt <span class="ot">&lt;-</span> <span class="fu">read_excel</span>(xlsx_example)</span></code></pre></div>
<p>查看数据</p>
<div class="sourceCode" id="cb7"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb7-1"><a href="readxl-description.html#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="fu">head</span>(dt)</span>
<span id="cb7-2"><a href="readxl-description.html#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; # A tibble: 6 x 5</span></span>
<span id="cb7-3"><a href="readxl-description.html#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;   Sepal.Length Sepal.Width Petal.Length Petal.Width Species</span></span>
<span id="cb7-4"><a href="readxl-description.html#cb7-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;          &lt;dbl&gt;       &lt;dbl&gt;        &lt;dbl&gt;       &lt;dbl&gt; &lt;chr&gt;  </span></span>
<span id="cb7-5"><a href="readxl-description.html#cb7-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 1          5.1         3.5          1.4         0.2 setosa </span></span>
<span id="cb7-6"><a href="readxl-description.html#cb7-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 2          4.9         3            1.4         0.2 setosa </span></span>
<span id="cb7-7"><a href="readxl-description.html#cb7-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 3          4.7         3.2          1.3         0.2 setosa </span></span>
<span id="cb7-8"><a href="readxl-description.html#cb7-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 4          4.6         3.1          1.5         0.2 setosa </span></span>
<span id="cb7-9"><a href="readxl-description.html#cb7-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 5          5           3.6          1.4         0.2 setosa </span></span>
<span id="cb7-10"><a href="readxl-description.html#cb7-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 6          5.4         3.9          1.7         0.4 setosa</span></span></code></pre></div>
<p>将 Excel 中的数据通过<code>read_excel()</code>读取保存到R中，该对象属于<code>tbl_df</code>类，是 tidyverse 系列的包数据框结构，是对 base R中的<code>data.frame</code>结构的改造，但是兼容<code>data.frame</code>。</p>
<div class="sourceCode" id="cb8"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb8-1"><a href="readxl-description.html#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="co"># 查看dt类</span></span>
<span id="cb8-2"><a href="readxl-description.html#cb8-2" aria-hidden="true" tabindex="-1"></a><span class="fu">class</span>(dt)</span>
<span id="cb8-3"><a href="readxl-description.html#cb8-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; [1] &quot;tbl_df&quot;     &quot;tbl&quot;        &quot;data.frame&quot;</span></span>
<span id="cb8-4"><a href="readxl-description.html#cb8-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb8-5"><a href="readxl-description.html#cb8-5" aria-hidden="true" tabindex="-1"></a><span class="co"># 查看数据类型</span></span>
<span id="cb8-6"><a href="readxl-description.html#cb8-6" aria-hidden="true" tabindex="-1"></a><span class="fu">str</span>(dt)</span>
<span id="cb8-7"><a href="readxl-description.html#cb8-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; tibble [150 x 5] (S3: tbl_df/tbl/data.frame)</span></span>
<span id="cb8-8"><a href="readxl-description.html#cb8-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  $ Sepal.Length: num [1:150] 5.1 4.9 4.7 4.6 5 5.4 4.6 5 4.4 4.9 ...</span></span>
<span id="cb8-9"><a href="readxl-description.html#cb8-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  $ Sepal.Width : num [1:150] 3.5 3 3.2 3.1 3.6 3.9 3.4 3.4 2.9 3.1 ...</span></span>
<span id="cb8-10"><a href="readxl-description.html#cb8-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  $ Petal.Length: num [1:150] 1.4 1.4 1.3 1.5 1.4 1.7 1.4 1.5 1.4 1.5 ...</span></span>
<span id="cb8-11"><a href="readxl-description.html#cb8-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  $ Petal.Width : num [1:150] 0.2 0.2 0.2 0.2 0.2 0.4 0.3 0.2 0.2 0.1 ...</span></span>
<span id="cb8-12"><a href="readxl-description.html#cb8-12" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  $ Species     : chr [1:150] &quot;setosa&quot; &quot;setosa&quot; &quot;setosa&quot; &quot;setosa&quot; ...</span></span></code></pre></div>
<blockquote>
<p>关于<code>tbl_df</code>类，可以查阅<code>vignette("tibble")</code>。</p>
</blockquote>
<p>2.指定 sheet 读取</p>
<p>通过函数<code>excel_sheets()</code>查看 Excel 的sheet名称</p>
<div class="sourceCode" id="cb9"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb9-1"><a href="readxl-description.html#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="fu">excel_sheets</span>(xlsx_example)</span>
<span id="cb9-2"><a href="readxl-description.html#cb9-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; [1] &quot;iris&quot;     &quot;mtcars&quot;   &quot;chickwts&quot; &quot;quakes&quot;</span></span></code></pre></div>
<p>当我们要读取 Excel 文件有多个 sheets 时，通过指定 sheet 参数,读取指定的 sheet，sheet 参数可以 是 sheet 的名称或顺序号。</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb10-1"><a href="readxl-description.html#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="fu">read_excel</span>(xlsx_example, <span class="at">sheet =</span> <span class="st">&quot;chickwts&quot;</span>)</span>
<span id="cb10-2"><a href="readxl-description.html#cb10-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; # A tibble: 71 x 2</span></span>
<span id="cb10-3"><a href="readxl-description.html#cb10-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;   weight feed     </span></span>
<span id="cb10-4"><a href="readxl-description.html#cb10-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;    &lt;dbl&gt; &lt;chr&gt;    </span></span>
<span id="cb10-5"><a href="readxl-description.html#cb10-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 1    179 horsebean</span></span>
<span id="cb10-6"><a href="readxl-description.html#cb10-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 2    160 horsebean</span></span>
<span id="cb10-7"><a href="readxl-description.html#cb10-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 3    136 horsebean</span></span>
<span id="cb10-8"><a href="readxl-description.html#cb10-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 4    227 horsebean</span></span>
<span id="cb10-9"><a href="readxl-description.html#cb10-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 5    217 horsebean</span></span>
<span id="cb10-10"><a href="readxl-description.html#cb10-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 6    168 horsebean</span></span>
<span id="cb10-11"><a href="readxl-description.html#cb10-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; # ... with 65 more rows</span></span>
<span id="cb10-12"><a href="readxl-description.html#cb10-12" aria-hidden="true" tabindex="-1"></a><span class="co"># not run</span></span>
<span id="cb10-13"><a href="readxl-description.html#cb10-13" aria-hidden="true" tabindex="-1"></a><span class="co">#read_excel(xlsx_example, sheet = 1)</span></span>
<span id="cb10-14"><a href="readxl-description.html#cb10-14" aria-hidden="true" tabindex="-1"></a><span class="co">#read_excel(xlsx_example, sheet = 3)</span></span></code></pre></div>
<p>3.指定读取范围</p>
<p>读取 Excel 文件指定范围。<code>read_excel()</code>中 range 参数接受单元格范围，最简单的表示方式即 Excle 中单元格表示方法,如 range = “D12:F15” or range = “R1C12:R6C15”。</p>
<div class="sourceCode" id="cb11"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb11-1"><a href="readxl-description.html#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="fu">read_excel</span>(xlsx_example, <span class="at">sheet =</span> <span class="st">&quot;iris&quot;</span>)</span>
<span id="cb11-2"><a href="readxl-description.html#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; # A tibble: 150 x 5</span></span>
<span id="cb11-3"><a href="readxl-description.html#cb11-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;   Sepal.Length Sepal.Width Petal.Length Petal.Width Species</span></span>
<span id="cb11-4"><a href="readxl-description.html#cb11-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;          &lt;dbl&gt;       &lt;dbl&gt;        &lt;dbl&gt;       &lt;dbl&gt; &lt;chr&gt;  </span></span>
<span id="cb11-5"><a href="readxl-description.html#cb11-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 1          5.1         3.5          1.4         0.2 setosa </span></span>
<span id="cb11-6"><a href="readxl-description.html#cb11-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 2          4.9         3            1.4         0.2 setosa </span></span>
<span id="cb11-7"><a href="readxl-description.html#cb11-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 3          4.7         3.2          1.3         0.2 setosa </span></span>
<span id="cb11-8"><a href="readxl-description.html#cb11-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 4          4.6         3.1          1.5         0.2 setosa </span></span>
<span id="cb11-9"><a href="readxl-description.html#cb11-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 5          5           3.6          1.4         0.2 setosa </span></span>
<span id="cb11-10"><a href="readxl-description.html#cb11-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 6          5.4         3.9          1.7         0.4 setosa </span></span>
<span id="cb11-11"><a href="readxl-description.html#cb11-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; # ... with 144 more rows</span></span>
<span id="cb11-12"><a href="readxl-description.html#cb11-12" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb11-13"><a href="readxl-description.html#cb11-13" aria-hidden="true" tabindex="-1"></a>dt1 <span class="ot">&lt;-</span> <span class="fu">read_excel</span>(xlsx_example, <span class="at">sheet =</span> <span class="st">&quot;iris&quot;</span>,<span class="at">range =</span> <span class="st">&#39;a1:e6&#39;</span>)</span>
<span id="cb11-14"><a href="readxl-description.html#cb11-14" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb11-15"><a href="readxl-description.html#cb11-15" aria-hidden="true" tabindex="-1"></a>dt2 <span class="ot">&lt;-</span> <span class="fu">read_excel</span>(xlsx_example, <span class="at">sheet =</span> <span class="st">&quot;iris&quot;</span>,<span class="at">range =</span> <span class="st">&#39;R1C1:R6C5&#39;</span>)</span>
<span id="cb11-16"><a href="readxl-description.html#cb11-16" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb11-17"><a href="readxl-description.html#cb11-17" aria-hidden="true" tabindex="-1"></a><span class="co"># dt1 dt2 是否相等</span></span>
<span id="cb11-18"><a href="readxl-description.html#cb11-18" aria-hidden="true" tabindex="-1"></a><span class="fu">identical</span>(dt1,dt2)</span>
<span id="cb11-19"><a href="readxl-description.html#cb11-19" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; [1] TRUE</span></span></code></pre></div>
<p>4.read_excel参数</p>
<p>readxl::read_excel 参数如下,请<code>?read_excel()</code>查看参数。</p>
<div class="sourceCode" id="cb12"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb12-1"><a href="readxl-description.html#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="fu">read_excel</span>(path, <span class="at">sheet =</span> <span class="cn">NULL</span>, <span class="at">range =</span> <span class="cn">NULL</span>, <span class="at">col_names =</span> <span class="cn">TRUE</span>,</span>
<span id="cb12-2"><a href="readxl-description.html#cb12-2" aria-hidden="true" tabindex="-1"></a>  <span class="at">col_types =</span> <span class="cn">NULL</span>, <span class="at">na =</span> <span class="st">&quot;&quot;</span>, <span class="at">trim_ws =</span> <span class="cn">TRUE</span>, <span class="at">skip =</span> <span class="dv">0</span>,</span>
<span id="cb12-3"><a href="readxl-description.html#cb12-3" aria-hidden="true" tabindex="-1"></a>  <span class="at">n_max =</span> <span class="cn">Inf</span>, <span class="at">guess_max =</span> <span class="fu">min</span>(<span class="dv">1000</span>, n_max),</span>
<span id="cb12-4"><a href="readxl-description.html#cb12-4" aria-hidden="true" tabindex="-1"></a>  <span class="at">progress =</span> <span class="fu">readxl_progress</span>(), <span class="at">.name_repair =</span> <span class="st">&quot;unique&quot;</span>)</span></code></pre></div>
<table>
<thead>
<tr class="header">
<th>read_excel参数</th>
<th>解释</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>path</td>
<td>xls或xlsx文件的路径</td>
</tr>
<tr class="even">
<td>sheet</td>
<td>默认是第一个sheet，可以是数字或sheet的名称</td>
</tr>
<tr class="odd">
<td>range</td>
<td>Excel中表示范围的字符，或者通过cell_类方法指定</td>
</tr>
<tr class="even">
<td>col_name</td>
<td>默认为TRUE,用第一行做列名;或者用默认名称,或者指定列名</td>
</tr>
<tr class="odd">
<td>col_types</td>
<td>默认为NULL，猜测各列类型，可指定各列的类型</td>
</tr>
<tr class="even">
<td>trim_ws</td>
<td>默认去掉表头字段中两边的空格</td>
</tr>
<tr class="odd">
<td>skip</td>
<td>读取之前要跳过的行数，默认为空</td>
</tr>
<tr class="even">
<td>n_max</td>
<td>读取的最大行数</td>
</tr>
<tr class="odd">
<td>guess_max</td>
<td>猜测列类型的最大行数,默认为1000</td>
</tr>
<tr class="even">
<td>progress</td>
<td>读取过程是否显示进度</td>
</tr>
<tr class="odd">
<td>.name_repair</td>
<td>自动处理列名，避免列名为空以及列名重复</td>
</tr>
</tbody>
</table>
<p>col_types 参数个人觉得比较重要，可以指定列的类型，可以避免一些错误。可用选项:“skip,” “guess,” “logical,” “numeric,” “date,” “text” or “list”。</p>
<p>.name_repair 参数能自动避免重复字段，可避免手工 Excel 出现字段名不唯一的情况。</p>
</div>
<div id="batch:read" class="section level3" number="1.1.3">
<h3><span class="header-section-number">1.1.3</span> 批量读取</h3>
<p>实际工作中，某文件夹下有相同格式的 Excel 文件(sheet名称以及列字段相同)，想要合并全部 Excel 数据，熟悉 Excel 的可以通过 Excel 的<code>power query</code>的获取数据完成合并，那么在R中该如何实现呢？</p>
<p>示例：</p>
<p>文件夹内 excel 文件</p>
<pre><code>#&gt; data/read-write/
#&gt; +-- a.xlsx
#&gt; +-- b.xlsx
#&gt; +-- PivotTable.xlsx
#&gt; \-- 批量读写.xlsx</code></pre>
<p>将文件夹『data/read-write』里以 a-z 开头的 xlsx 文件合并读取，R代码如下：</p>
<ul>
<li>base R</li>
</ul>
<p>不借助R包，使用 base R 实现</p>
<div class="sourceCode" id="cb14"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb14-1"><a href="readxl-description.html#cb14-1" aria-hidden="true" tabindex="-1"></a>allfiles <span class="ot">&lt;-</span> <span class="fu">list.files</span>(<span class="at">path =</span> <span class="st">&#39;data/read-write/&#39;</span>,<span class="at">pattern =</span> <span class="st">&#39;^[a-z].xlsx$&#39;</span>,<span class="at">full.names =</span> <span class="cn">TRUE</span>)</span>
<span id="cb14-2"><a href="readxl-description.html#cb14-2" aria-hidden="true" tabindex="-1"></a>datalist <span class="ot">&lt;-</span> <span class="fu">lapply</span>(allfiles,readxl<span class="sc">::</span>read_excel)</span>
<span id="cb14-3"><a href="readxl-description.html#cb14-3" aria-hidden="true" tabindex="-1"></a><span class="fu">do.call</span>(rbind,datalist)</span>
<span id="cb14-4"><a href="readxl-description.html#cb14-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; # A tibble: 6 x 2</span></span>
<span id="cb14-5"><a href="readxl-description.html#cb14-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;    name   num</span></span>
<span id="cb14-6"><a href="readxl-description.html#cb14-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;   &lt;dbl&gt; &lt;dbl&gt;</span></span>
<span id="cb14-7"><a href="readxl-description.html#cb14-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 1     1     1</span></span>
<span id="cb14-8"><a href="readxl-description.html#cb14-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 2     2     2</span></span>
<span id="cb14-9"><a href="readxl-description.html#cb14-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 3     3     3</span></span>
<span id="cb14-10"><a href="readxl-description.html#cb14-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 4     1     1</span></span>
<span id="cb14-11"><a href="readxl-description.html#cb14-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 5     2     2</span></span>
<span id="cb14-12"><a href="readxl-description.html#cb14-12" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 6     3     3</span></span></code></pre></div>
<ul>
<li>purrr</li>
</ul>
<p>使用 purrr 包合并读取</p>
<div class="sourceCode" id="cb15"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb15-1"><a href="readxl-description.html#cb15-1" aria-hidden="true" tabindex="-1"></a>allfiles <span class="ot">&lt;-</span> <span class="fu">list.files</span>(<span class="at">path =</span> <span class="st">&#39;./data/read-write/&#39;</span>,<span class="at">pattern =</span> <span class="st">&#39;^[a-z].xlsx$&#39;</span>,<span class="at">full.names =</span> T)</span>
<span id="cb15-2"><a href="readxl-description.html#cb15-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb15-3"><a href="readxl-description.html#cb15-3" aria-hidden="true" tabindex="-1"></a>purrr<span class="sc">::</span><span class="fu">map_dfr</span>(allfiles,read_excel)</span>
<span id="cb15-4"><a href="readxl-description.html#cb15-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; # A tibble: 6 x 2</span></span>
<span id="cb15-5"><a href="readxl-description.html#cb15-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;    name   num</span></span>
<span id="cb15-6"><a href="readxl-description.html#cb15-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;   &lt;dbl&gt; &lt;dbl&gt;</span></span>
<span id="cb15-7"><a href="readxl-description.html#cb15-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 1     1     1</span></span>
<span id="cb15-8"><a href="readxl-description.html#cb15-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 2     2     2</span></span>
<span id="cb15-9"><a href="readxl-description.html#cb15-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 3     3     3</span></span>
<span id="cb15-10"><a href="readxl-description.html#cb15-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 4     1     1</span></span>
<span id="cb15-11"><a href="readxl-description.html#cb15-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 5     2     2</span></span>
<span id="cb15-12"><a href="readxl-description.html#cb15-12" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 6     3     3</span></span></code></pre></div>
<p><code>list.files()</code>函数按照规则返回某文件目录下的全部文件。关于R语言中文件系统操作可以查看章节<a href="file-system-operation.html#file:system-operation">R语言文件系统操作</a></p>
</div>
<div id="batch:write" class="section level3" number="1.1.4">
<h3><span class="header-section-number">1.1.4</span> 批量输出</h3>
<p>我们按照一定条件拆解数据集，分别输出，代码如下：</p>
<div class="sourceCode" id="cb16"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb16-1"><a href="readxl-description.html#cb16-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(tidyverse)</span>
<span id="cb16-2"><a href="readxl-description.html#cb16-2" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(readxl)</span>
<span id="cb16-3"><a href="readxl-description.html#cb16-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb16-4"><a href="readxl-description.html#cb16-4" aria-hidden="true" tabindex="-1"></a>dt <span class="ot">&lt;-</span> <span class="fu">read_xlsx</span>(<span class="at">path =</span> <span class="st">&#39;./data/read-write/批量读写.xlsx&#39;</span>)</span>
<span id="cb16-5"><a href="readxl-description.html#cb16-5" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb16-6"><a href="readxl-description.html#cb16-6" aria-hidden="true" tabindex="-1"></a>dt <span class="sc">%&gt;%</span> </span>
<span id="cb16-7"><a href="readxl-description.html#cb16-7" aria-hidden="true" tabindex="-1"></a>  <span class="fu">group_by</span>(name) <span class="sc">%&gt;%</span> </span>
<span id="cb16-8"><a href="readxl-description.html#cb16-8" aria-hidden="true" tabindex="-1"></a>  <span class="fu">group_walk</span>(<span class="sc">~</span> <span class="fu">write.csv</span>(.x,<span class="at">file =</span> <span class="fu">file.path</span>(<span class="st">&#39;data/read-write&#39;</span>,<span class="fu">paste0</span>(.y<span class="sc">$</span>name,<span class="st">&#39;.csv&#39;</span>))))</span>
<span id="cb16-9"><a href="readxl-description.html#cb16-9" aria-hidden="true" tabindex="-1"></a><span class="fu">list.files</span>(<span class="at">path =</span> <span class="st">&#39;data/read-write/&#39;</span>)</span>
<span id="cb16-10"><a href="readxl-description.html#cb16-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; [1] &quot;a.csv&quot;            &quot;a.xlsx&quot;           &quot;b.csv&quot;            &quot;b.xlsx&quot;          </span></span>
<span id="cb16-11"><a href="readxl-description.html#cb16-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; [5] &quot;d.csv&quot;            &quot;Id-card-data.csv&quot; &quot;PivotTable.xlsx&quot;  &quot;批量读写.xlsx&quot;</span></span></code></pre></div>
<blockquote>
<p>暂时不用理解批量读取和输出的代码具体含义，可以先记住用法。</p>
</blockquote>
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